During my session at the recent Microsoft Exchange Conference (MEC), I revealed Microsoft’s preferred architecture (PA) for Exchange Server 2013. The PA is the Exchange Engineering Team’s prescriptive approach to what we believe is the optimum deployment architecture for Exchange 2013, and one that is very similar to what we deploy in Office 365.
While Exchange 2013 offers a wide variety of architectural choices for on-premises deployments, the architecture discussed below is our most scrutinized one ever. While there are other supported deployment architectures, other architectures are not recommended.
The PA is designed with several business requirements in mind. For example, requirements that the architecture be able to:
Include both high availability within the datacenter, and site resilience between datacenters
Support multiple copies of each database, thereby allowing for quick activation
Reduce the cost of the messaging infrastructure
Increase availability by optimizing around failure domains and reducing complexity
The specific prescriptive nature of the PA means of course that not every customer will be able to deploy it (for example, customers without multiple datacenters). And some of our customers have different business requirements or other needs, which necessitate an architecture different from that shown here. If you fall into those categories, and you want to deploy Exchange on-premises, there are still advantages to adhering as closely as possible to the PA where possible, and deviate only where your requirements widely differ. Alternatively, you can consider Office 365 where you can take advantage of the PA without having to deploy or manage servers.
Before I delve into the PA, I think it is important that you understand a concept that is the cornerstone for this architecture – simplicity.
Simplicity
Failure happens. There is no technology that can change this. Disks, servers, racks, network appliances, cables, power substations, generators, operating systems, applications (like Exchange), drivers, and other services – there is simply no part of an IT services offering that is not subject to failure.
One way to mitigate failure is to build in redundancy. Where one entity is likely to fail, two or more entities are used. This pattern can be observed in Web server arrays, disk arrays, and the like. But redundancy by itself can be prohibitively expensive (simple multiplication of cost). For example, the cost and complexity of the SAN based storage system that was at the heart of Exchange until the 2007 release, drove the Exchange Team to step up its investment in the storage stack and to evolve the Exchange application to integrate the important elements of storage directly into its architecture. We recognized that every SAN system would ultimately fail, and that implementing a highly redundant system using SAN technology would be cost-prohibitive. In response, Exchange has evolved from requiring expensive, scaled-up, high-performance SAN storage and related peripherals, to now being able to run on cheap, scaled-out servers with commodity, low-performance SAS/SATA drives in a JBOD configuration with commodity disk controllers. This architecture enables Exchange to be resilient to any storage related failure, while enabling you to deploy large mailboxes at a reasonable cost.
By building the replication architecture into Exchange and optimizing Exchange for commodity storage, the failure mode is predictable from a storage perspective. This approach does not stop at the storage layer; redundant NICs, power supplies, etc., can also be removed from the server hardware. Whether it is a disk, controller, or motherboard that fails, the end result should be the same, another database copy is activated and takes over.
The more complex the hardware or software architecture, the more unpredictable failure events can be. Managing failure at any scale is all about making recovery predictable, which drives the necessity to having predictable failure modes. Examples of complex redundancy are active/passive network appliance pairs, aggregation points on the network with complex routing configurations, network teaming, RAID, multiple fiber pathways, etc. Removing complex redundancy seems unintuitive on its face – how can removing redundancy increase availability? Moving away from complex redundancy models to a software-based redundancy model, creates a predictable failure mode.
The PA removes complexity and redundancy where necessary to drive the architecture to a predictable recovery model: when a failure occurs, another copy of the affected database is activated.
The PA is divided into four areas of focus:
Namespace design
Datacenter design
Server design
DAG design
Namespace Design
In the Namespace Planning and Load Balancing Principles articles, I outlined the various configuration choices that are available with Exchange 2013. From a namespace perspective, the choices are to either deploy a bound namespace (having a preference for the users to operate out of a specific datacenter) or an unbound namespace (having the users connect to any datacenter without preference).
The recommended approach is to utilize the unbound model, deploying a single namespace per client protocol for the site resilient datacenter pair (where each datacenter is assumed to represent its own Active Directory site - see more details on that below). For example:
autodiscover.contoso.com
For HTTP clients: mail.contoso.com
For IMAP clients: imap.contoso.com
For SMTP clients: smtp.contoso.com
Figure 1: Namespace Design
Each namespace is load balanced across both datacenters in a configuration that does not leverage session affinity, resulting in fifty percent of traffic being proxied between datacenters. Traffic is equally distributed across the datacenters in the site resilient pair, via DNS round-robin, geo-DNS, or other similar solution you may have at your disposal. Though from our perspective, the simpler solution is the least complex and easier to manage, so our recommendation is to leverage DNS round-robin.
In the event that you have multiple site resilient datacenter pairs in your environment, you will need to decide if you want to have a single worldwide namespace, or if you want to control the traffic to each specific datacenter pair by using regional namespaces. Ultimately your decision depends on your network topology and the associated cost with using an unbound model; for example, if you have datacenters located in North America and Europe, the network link between these regions might not only be costly, but it might also have high latency, which can introduce user pain and operational issues. In that case, it makes sense to deploy a bound model with a separate namespace for each region.
Site Resilient Datacenter Pair Design
To achieve a highly available and site resilient architecture, you must have two or more datacenters that are well-connected (ideally, you want a low round-trip network latency, otherwise replication and the client experience are adversely affected). In addition, the datacenters should be connected via redundant network paths supplied by different operating carriers.
While we support stretching an Active Directory site across multiple datacenters, for the PA we recommend having each datacenter be its own Active Directory site. There are two reasons:
Transport site resilience via Shadow Redundancy and Safety Net can only be achieved when the DAG has members located in more than one Active Directory site.
Active Directory has published guidance that states that subnets should be placed in different Active Directory sites when the round trip latency is greater than 10ms between the subnets.
Server Design
In the PA, all servers are physical, multi-role servers. Physical hardware is deployed rather than virtualized hardware for two reasons:
The servers are scaled to utilize eighty percent of resources during the worst-failure mode.
Virtualization adds an additional layer of management and complexity, which introduces additional recovery modes that do not add value, as Exchange provides equivalent functionality out of the box.
By deploying multi-role servers, the architecture is simplified as all servers have the same hardware, installation process, and configuration options. Consistency across servers also simplifies administration. Multi-role servers provide more efficient use of server resources by distributing the Client Access and Mailbox resources across a larger pool of servers. Client Access and Database Availability Group (DAG) resiliency is also increased, as there are more servers available for the load-balanced pool and for the DAG.
Commodity server platforms (e.g., 2U, dual socket servers with no more than 24 processor cores and 96GB of memory, that hold 12 large form-factor drive bays within the server chassis) are use in the PA. Additional drive bays can be deployed per-server depending on the number of mailboxes, mailbox size, and the server’s scalability.
Each server houses a single RAID1 disk pair for the operating system, Exchange binaries, protocol/client logs, and transport database. The rest of the storage is configured as JBOD, using large capacity 7.2K RPM serially attached SCSI (SAS) disks (while SATA disks are also available, the SAS equivalent provides better IO and a lower annualized failure rate). Bitlocker is used to encrypt each disk, thereby providing data encryption at rest and mitigating concerns around data theft via disk replacement.
To ensure that the capacity and IO of each disk is used as efficiently as possible, four database copies are deployed per-disk. The normal run-time copy layout (calculated in the Exchange 2013 Server Role Requirements Calculator) ensures that there is no more than a single copy activated per-disk.
Figure 2: Server Design
At least one disk in the disk pool is reserved as a hot spare. AutoReseed is enabled and quickly restores database redundancy after a disk failure by activating the hot spare and initiating database copy reseeds.
Database Availability Group Design
Within each site resilient datacenter pair you will have one or more DAGs.
DAG Configuration
As with the namespace model, each DAG within the site resilient datacenter pair operates in an unbound model with active copies distributed equally across all servers in the DAG. This model provides two benefits:
Ensures that each DAG member’s full stack of services is being validated (client connectivity, replication pipeline, transport, etc.).
Distributes the load across as many servers as possible during a failure scenario, thereby only incrementally increasing resource utilization across the remaining members within the DAG.
Each datacenter is symmetrical, with an equal number of member servers within a DAG residing in each datacenter. This means that each DAG contains an even number of servers and uses a witness server for quorum arbitration.
The DAG is the fundamental building block in Exchange 2013. With respect to DAG size, a larger DAG provides more redundancy and resources. Within the PA, the goal is to deploy larger DAGs (typically starting out with an eight member DAG and increasing the number of servers as required to meet your requirements) and only create new DAGs when scalability introduces concerns over the existing database copy layout.
DAG Network Design
Since the introduction of continuous replication in Exchange 2007, Exchange has recommended multiple replication networks for separating client traffic from replication traffic. Deploying two networks allows you to isolate certain traffic along different network pathways and ensure that during certain events (e.g., reseed events) the network interface is not saturated (which is an issue with 100Mb, and to a certain extent, 1Gb interfaces). However, for most customers, having two networks operating in this manner was only a logical separation, as the same copper fabric was used by both networks in the underlying network architecture.
With 10Gb networks becoming the standard, the PA moves away from the previous guidance of separating client traffic from replication traffic. A single network interface is all that is needed because ultimately our goal is to achieve a standard recovery model despite the failure - whether a server failure occurs or a network failure occurs, the result is the same, a database copy is activated on another server within the DAG. This architectural change simplifies the network stack, and obviates the need to eliminate heartbeat cross-talk.
Witness Server Placement
Ultimately, the placement of the witness server determines whether the architecture can provide automatic datacenter failover capabilities or whether it will require a manual activation to enable service in the event of a site failure.
If your organization has a third location with a network infrastructure that is isolated from network failures that affect the site resilient datacenter pair in which the DAG is deployed, then the recommendation is to deploy the DAG’s witness server in that third location. This configuration gives the DAG the ability to automatically failover databases to the other datacenter in response to a datacenter-level failure event, regardless of which datacenter has the outage.
Figure 3: DAG (Three Datacenter) Design
If your organization does not have a third location, then place the witness server in one of the datacenters within the site resilient datacenter pair. If you have multiple DAGs within the site resilient datacenter pair, then place the witness server for all DAGs in the same datacenter (typically the datacenter where the majority of the users are physically located). Also, make sure the Primary Active Manager (PAM) for each DAG is also located in the same datacenter.
Data Resiliency
Data resiliency is achieved by deploying multiple database copies. In the PA, database copies are distributed across the site resilient datacenter pair, thereby ensuring that mailbox data is protected from software, hardware and even datacenter failures.
Each database has four copies, with two copies in each datacenter, which means at a minimum, the PA requires four servers. Out of these four copies, three of them are configured as highly available. The fourth copy (the copy with the highest Activation Preference) is configured as a lagged database copy. Due to the server design, each copy of a database is isolated from its other copies, thereby reducing failure domains and increasing the overall availability of the solution as discussed in DAG: Beyond the “A”.
The purpose of the lagged database copy is to provide a recovery mechanism for the rare event of system-wide, catastrophic logical corruption. It is not intended for individual mailbox recovery or mailbox item recovery.
The lagged database copy is configured with a seven day ReplayLagTime. In addition, the Replay Lag Manager is also enabled to provide dynamic log file play down for lagged copies. This feature ensures that the lagged database copy can be automatically played down and made highly available in the following scenarios:
When a low disk space threshold is reached
When the lagged copy has physical corruption and needs to be page patched
When there are fewer than three available healthy copies (active or passive) for more than 24 hours
By using the lagged database copy in this manner, it is important to understand that the lagged database copy is not a guaranteed point-in-time backup. The lagged database copy will have an availability threshold, typically around 90%, due to periods where the disk containing a lagged copy is lost due to disk failure, the lagged copy becoming an HA copy (due to automatic play down), as well as, the periods where the lagged database copy is re-building the replay queue.
To protect against accidental (or malicious) item deletion, Single Item Recovery or In-Place Hold technologies are used, and the Deleted Item Retention window is set to a value that meets or exceeds any defined item-level recovery SLA.
With all of these technologies in play, traditional backups are unnecessary; as a result, the PA leverages Exchange Native Data Protection.
Summary
The PA takes advantage of the changes made in Exchange 2013 to simplify your Exchange deployment, without decreasing the availability or the resiliency of the deployment. And in some scenarios, when compared to previous generations, the PA increases availability and resiliency of your deployment.
Ross Smith IV Principal Program Manager Office 365 Customer Experience
Ross, would you still say that traditional backups are unnecessary even when a network worm takes out all IP connected servers? Wouldn't an off-site backup be the only way to recover your servers in that scenario? Remember, there is a reason we have to
apply Windows updates every month ;)
Also, the same threat exists with a malicious attacker (could be an internal disgruntled employee) who targets the host operating systems. Without an off-site backup your organization would have 100% data loss. Then you would be wishing for traditional backups
Why the recommendation for hosting Exchange on physical servers? Microsoft is propagating all workloads to be virtualized on Hyper-V, so I don't get why Exchange 2013 should be running on physical servers. The arguments given in this article to host Exchange
on physical servers, are quite weak. First, most of the infrastructures I've seen have the capacity to host Exchange in VM's in worst case scenario's, second, the complexity which is added by virtualize Exchange, is actually no complexity, as SysAdmins are
getting more and more proficient into managing virtual platforms. It's like the Exchange department is contradicting Microsoft's vision of putting everything in the cloud (which means in this case virtualizing the workloads). Please enlighten me (-:
@Ross - Thanks that covers my question superbly. I had been hesitant to recommend Exchnage Native Data Protection because that answer was missing. With this, I am much more comfortable in supporting that choice. Cheers.
are there any plans to highlight this critical bug on the blog? it would be good to let anyone who hasn't migrated mailboxes yet to not get rid of their old DBs - this is wreaking havoc for us and a lot of others:
it would be nice if Microsoft preferred architecture was revealed on the same TIME that the product became GA, and even nicer if Microsoft Exchange advisers would know that before they advice for customers....
Great article that compiles main parts of the Exchange 2013 design but may be it was interesting to have a guidance about "Dynamic cluster" with Windows Server 2012 R2 as explained in the Schott blog post.
Any input about that : dynamic quorum and no DAG CNO ?
First ,excellent post and thanks. 1. regarding dns, if we use dns round robin(client gets different response every time) we rely on dns cache right? so better use two ips but disable round robin(at the "internet"/"access level so the clients can recover from a datacenter outage quicker no? 2. how can we utilize even 1gb link when the underlying disk subsystem(sata/sas) cannot even get to these speeds on jbods?(that's one of the main things which was always negative for me when discussing with clients the jbod approach which I support)
Great info. It would be great to hear about some of the patching strategies that O365 has adopted and if some large on-prem folks could take away any good ideas. Lastly, does O365 utilize any of the PowerShell DSC coolness?
Very interesting! Can you provide som additional details o. The JBOD? You let each of the 10 data disk become a seperate volume and drive letter (or mount in a directory) or do you configure Storage Spaces with Simple/Mirror/Parity?
What exactly is the following quoted text referring to? "The purpose of the lagged database copy is to provide a recovery mechanism for the rare event of system-wide, catastrophic logical corruption." What type of corruption and how would this corruption be detected? Especially in 7 days. I have seen this reference before, with no clear description.
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During my session at the recent Microsoft Exchange Conference (MEC), I revealed Microsoft’s preferred architecture (PA) for Exchange Server 2013. The PA is the Exchange Engineering Team’s prescriptive approach to what we believe is the optimum deployment architecture for Exchange 2013, and one that is very similar to what we deploy in Office 365.
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While Exchange 2013 offers a wide variety of architectural choices for on-premises deployments, the architecture discussed below is our most scrutinized one ever. While there are other supported deployment architectures, other architectures are not recommended.
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The PA is designed with several business requirements in mind. For example, requirements that the architecture be able to:
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Include both high availability within the datacenter, and site resilience between datacenters
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Support multiple copies of each database, thereby allowing for quick activation
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Reduce the cost of the messaging infrastructure
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Increase availability by optimizing around failure domains and reducing complexity
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The specific prescriptive nature of the PA means of course that not every customer will be able to deploy it (for example, customers without multiple datacenters). And some of our customers have different business requirements or other needs, which necessitate an architecture different from that shown here. If you fall into those categories, and you want to deploy Exchange on-premises, there are still advantages to adhering as closely as possible to the PA where possible, and deviate only where your requirements widely differ. Alternatively, you can consider Office 365 where you can take advantage of the PA without having to deploy or manage servers.
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Before I delve into the PA, I think it is important that you understand a concept that is the cornerstone for this architecture – simplicity.
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Simplicity
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Failure happens. There is no technology that can change this. Disks, servers, racks, network appliances, cables, power substations, generators, operating systems, applications (like Exchange), drivers, and other services – there is simply no part of an IT services offering that is not subject to failure.
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One way to mitigate failure is to build in redundancy. Where one entity is likely to fail, two or more entities are used. This pattern can be observed in Web server arrays, disk arrays, and the like. But redundancy by itself can be prohibitively expensive (simple multiplication of cost). For example, the cost and complexity of the SAN based storage system that was at the heart of Exchange until the 2007 release, drove the Exchange Team to step up its investment in the storage stack and to evolve the Exchange application to integrate the important elements of storage directly into its architecture. We recognized that every SAN system would ultimately fail, and that implementing a highly redundant system using SAN technology would be cost-prohibitive. In response, Exchange has evolved from requiring expensive, scaled-up, high-performance SAN storage and related peripherals, to now being able to run on cheap, scaled-out servers with commodity, low-performance SAS/SATA drives in a JBOD configuration with commodity disk controllers. This architecture enables Exchange to be resilient to any storage related failure, while enabling you to deploy large mailboxes at a reasonable cost.
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By building the replication architecture into Exchange and optimizing Exchange for commodity storage, the failure mode is predictable from a storage perspective. This approach does not stop at the storage layer; redundant NICs, power supplies, etc., can also be removed from the server hardware. Whether it is a disk, controller, or motherboard that fails, the end result should be the same, another database copy is activated and takes over.
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The more complex the hardware or software architecture, the more unpredictable failure events can be. Managing failure at any scale is all about making recovery predictable, which drives the necessity to having predictable failure modes. Examples of complex redundancy are active/passive network appliance pairs, aggregation points on the network with complex routing configurations, network teaming, RAID, multiple fiber pathways, etc. Removing complex redundancy seems unintuitive on its face – how can removing redundancy increase availability? Moving away from complex redundancy models to a software-based redundancy model, creates a predictable failure mode.
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The PA removes complexity and redundancy where necessary to drive the architecture to a predictable recovery model: when a failure occurs, another copy of the affected database is activated.
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The PA is divided into four areas of focus:
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Namespace design
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Datacenter design
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Server design
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DAG design
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Namespace Design
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In the Namespace Planning and Load Balancing Principles articles, I outlined the various configuration choices that are available with Exchange 2013. From a namespace perspective, the choices are to either deploy a bound namespace (having a preference for the users to operate out of a specific datacenter) or an unbound namespace (having the users connect to any datacenter without preference).
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The recommended approach is to utilize the unbound model, deploying a single namespace per client protocol for the site resilient datacenter pair (where each datacenter is assumed to represent its own Active Directory site - see more details on that below). For example:
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autodiscover.contoso.com
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For HTTP clients: mail.contoso.com
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For IMAP clients: imap.contoso.com
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For SMTP clients: smtp.contoso.com
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Figure 1: Namespace Design
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Each namespace is load balanced across both datacenters in a configuration that does not leverage session affinity, resulting in fifty percent of traffic being proxied between datacenters. Traffic is equally distributed across the datacenters in the site resilient pair, via DNS round-robin, geo-DNS, or other similar solution you may have at your disposal. Though from our perspective, the simpler solution is the least complex and easier to manage, so our recommendation is to leverage DNS round-robin.
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In the event that you have multiple site resilient datacenter pairs in your environment, you will need to decide if you want to have a single worldwide namespace, or if you want to control the traffic to each specific datacenter pair by using regional namespaces. Ultimately your decision depends on your network topology and the associated cost with using an unbound model; for example, if you have datacenters located in North America and Europe, the network link between these regions might not only be costly, but it might also have high latency, which can introduce user pain and operational issues. In that case, it makes sense to deploy a bound model with a separate namespace for each region.
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Site Resilient Datacenter Pair Design
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To achieve a highly available and site resilient architecture, you must have two or more datacenters that are well-connected (ideally, you want a low round-trip network latency, otherwise replication and the client experience are adversely affected). In addition, the datacenters should be connected via redundant network paths supplied by different operating carriers.
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While we support stretching an Active Directory site across multiple datacenters, for the PA we recommend having each datacenter be its own Active Directory site. There are two reasons:
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Transport site resilience via Shadow Redundancy and Safety Net can only be achieved when the DAG has members located in more than one Active Directory site.
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Active Directory has published guidance that states that subnets should be placed in different Active Directory sites when the round trip latency is greater than 10ms between the subnets.
\n\n
Server Design
\n
In the PA, all servers are physical, multi-role servers. Physical hardware is deployed rather than virtualized hardware for two reasons:
\n\n
The servers are scaled to utilize eighty percent of resources during the worst-failure mode.
\n
Virtualization adds an additional layer of management and complexity, which introduces additional recovery modes that do not add value, as Exchange provides equivalent functionality out of the box.
\n\n
By deploying multi-role servers, the architecture is simplified as all servers have the same hardware, installation process, and configuration options. Consistency across servers also simplifies administration. Multi-role servers provide more efficient use of server resources by distributing the Client Access and Mailbox resources across a larger pool of servers. Client Access and Database Availability Group (DAG) resiliency is also increased, as there are more servers available for the load-balanced pool and for the DAG.
\n
Commodity server platforms (e.g., 2U, dual socket servers with no more than 24 processor cores and 96GB of memory, that hold 12 large form-factor drive bays within the server chassis) are use in the PA. Additional drive bays can be deployed per-server depending on the number of mailboxes, mailbox size, and the server’s scalability.
\n
Each server houses a single RAID1 disk pair for the operating system, Exchange binaries, protocol/client logs, and transport database. The rest of the storage is configured as JBOD, using large capacity 7.2K RPM serially attached SCSI (SAS) disks (while SATA disks are also available, the SAS equivalent provides better IO and a lower annualized failure rate). Bitlocker is used to encrypt each disk, thereby providing data encryption at rest and mitigating concerns around data theft via disk replacement.
\n
To ensure that the capacity and IO of each disk is used as efficiently as possible, four database copies are deployed per-disk. The normal run-time copy layout (calculated in the Exchange 2013 Server Role Requirements Calculator) ensures that there is no more than a single copy activated per-disk.
\n
Figure 2: Server Design
\n
At least one disk in the disk pool is reserved as a hot spare. AutoReseed is enabled and quickly restores database redundancy after a disk failure by activating the hot spare and initiating database copy reseeds.
\n
Database Availability Group Design
\n
Within each site resilient datacenter pair you will have one or more DAGs.
\n
DAG Configuration
\n
As with the namespace model, each DAG within the site resilient datacenter pair operates in an unbound model with active copies distributed equally across all servers in the DAG. This model provides two benefits:
\n\n
Ensures that each DAG member’s full stack of services is being validated (client connectivity, replication pipeline, transport, etc.).
\n
Distributes the load across as many servers as possible during a failure scenario, thereby only incrementally increasing resource utilization across the remaining members within the DAG.
\n\n
Each datacenter is symmetrical, with an equal number of member servers within a DAG residing in each datacenter. This means that each DAG contains an even number of servers and uses a witness server for quorum arbitration.
\n
The DAG is the fundamental building block in Exchange 2013. With respect to DAG size, a larger DAG provides more redundancy and resources. Within the PA, the goal is to deploy larger DAGs (typically starting out with an eight member DAG and increasing the number of servers as required to meet your requirements) and only create new DAGs when scalability introduces concerns over the existing database copy layout.
\n
DAG Network Design
\n
Since the introduction of continuous replication in Exchange 2007, Exchange has recommended multiple replication networks for separating client traffic from replication traffic. Deploying two networks allows you to isolate certain traffic along different network pathways and ensure that during certain events (e.g., reseed events) the network interface is not saturated (which is an issue with 100Mb, and to a certain extent, 1Gb interfaces). However, for most customers, having two networks operating in this manner was only a logical separation, as the same copper fabric was used by both networks in the underlying network architecture.
\n
With 10Gb networks becoming the standard, the PA moves away from the previous guidance of separating client traffic from replication traffic. A single network interface is all that is needed because ultimately our goal is to achieve a standard recovery model despite the failure - whether a server failure occurs or a network failure occurs, the result is the same, a database copy is activated on another server within the DAG. This architectural change simplifies the network stack, and obviates the need to eliminate heartbeat cross-talk.
\n
Witness Server Placement
\n
Ultimately, the placement of the witness server determines whether the architecture can provide automatic datacenter failover capabilities or whether it will require a manual activation to enable service in the event of a site failure.
\n
If your organization has a third location with a network infrastructure that is isolated from network failures that affect the site resilient datacenter pair in which the DAG is deployed, then the recommendation is to deploy the DAG’s witness server in that third location. This configuration gives the DAG the ability to automatically failover databases to the other datacenter in response to a datacenter-level failure event, regardless of which datacenter has the outage.
\n
Figure 3: DAG (Three Datacenter) Design
\n
If your organization does not have a third location, then place the witness server in one of the datacenters within the site resilient datacenter pair. If you have multiple DAGs within the site resilient datacenter pair, then place the witness server for all DAGs in the same datacenter (typically the datacenter where the majority of the users are physically located). Also, make sure the Primary Active Manager (PAM) for each DAG is also located in the same datacenter.
\n
Data Resiliency
\n
Data resiliency is achieved by deploying multiple database copies. In the PA, database copies are distributed across the site resilient datacenter pair, thereby ensuring that mailbox data is protected from software, hardware and even datacenter failures.
\n
Each database has four copies, with two copies in each datacenter, which means at a minimum, the PA requires four servers. Out of these four copies, three of them are configured as highly available. The fourth copy (the copy with the highest Activation Preference) is configured as a lagged database copy. Due to the server design, each copy of a database is isolated from its other copies, thereby reducing failure domains and increasing the overall availability of the solution as discussed in DAG: Beyond the “A”.
\n
The purpose of the lagged database copy is to provide a recovery mechanism for the rare event of system-wide, catastrophic logical corruption. It is not intended for individual mailbox recovery or mailbox item recovery.
\n
The lagged database copy is configured with a seven day ReplayLagTime. In addition, the Replay Lag Manager is also enabled to provide dynamic log file play down for lagged copies. This feature ensures that the lagged database copy can be automatically played down and made highly available in the following scenarios:
\n
\n
When a low disk space threshold is reached
\n
When the lagged copy has physical corruption and needs to be page patched
\n
When there are fewer than three available healthy copies (active or passive) for more than 24 hours
\n
\n
By using the lagged database copy in this manner, it is important to understand that the lagged database copy is not a guaranteed point-in-time backup. The lagged database copy will have an availability threshold, typically around 90%, due to periods where the disk containing a lagged copy is lost due to disk failure, the lagged copy becoming an HA copy (due to automatic play down), as well as, the periods where the lagged database copy is re-building the replay queue.
\n
To protect against accidental (or malicious) item deletion, Single Item Recovery or In-Place Hold technologies are used, and the Deleted Item Retention window is set to a value that meets or exceeds any defined item-level recovery SLA.
\n
With all of these technologies in play, traditional backups are unnecessary; as a result, the PA leverages Exchange Native Data Protection.
\n
Summary
\n
The PA takes advantage of the changes made in Exchange 2013 to simplify your Exchange deployment, without decreasing the availability or the resiliency of the deployment. And in some scenarios, when compared to previous generations, the PA increases availability and resiliency of your deployment.
\n
Ross Smith IV Principal Program Manager Office 365 Customer Experience
","body@stringLength":"23246","rawBody":"
During my session at the recent Microsoft Exchange Conference (MEC), I revealed Microsoft’s preferred architecture (PA) for Exchange Server 2013. The PA is the Exchange Engineering Team’s prescriptive approach to what we believe is the optimum deployment architecture for Exchange 2013, and one that is very similar to what we deploy in Office 365.
\n
While Exchange 2013 offers a wide variety of architectural choices for on-premises deployments, the architecture discussed below is our most scrutinized one ever. While there are other supported deployment architectures, other architectures are not recommended.
\n
The PA is designed with several business requirements in mind. For example, requirements that the architecture be able to:
\n
\n
Include both high availability within the datacenter, and site resilience between datacenters
\n
Support multiple copies of each database, thereby allowing for quick activation
\n
Reduce the cost of the messaging infrastructure
\n
Increase availability by optimizing around failure domains and reducing complexity
\n
\n
The specific prescriptive nature of the PA means of course that not every customer will be able to deploy it (for example, customers without multiple datacenters). And some of our customers have different business requirements or other needs, which necessitate an architecture different from that shown here. If you fall into those categories, and you want to deploy Exchange on-premises, there are still advantages to adhering as closely as possible to the PA where possible, and deviate only where your requirements widely differ. Alternatively, you can consider Office 365 where you can take advantage of the PA without having to deploy or manage servers.
\n
Before I delve into the PA, I think it is important that you understand a concept that is the cornerstone for this architecture – simplicity.
\n
Simplicity
\n
Failure happens. There is no technology that can change this. Disks, servers, racks, network appliances, cables, power substations, generators, operating systems, applications (like Exchange), drivers, and other services – there is simply no part of an IT services offering that is not subject to failure.
\n
One way to mitigate failure is to build in redundancy. Where one entity is likely to fail, two or more entities are used. This pattern can be observed in Web server arrays, disk arrays, and the like. But redundancy by itself can be prohibitively expensive (simple multiplication of cost). For example, the cost and complexity of the SAN based storage system that was at the heart of Exchange until the 2007 release, drove the Exchange Team to step up its investment in the storage stack and to evolve the Exchange application to integrate the important elements of storage directly into its architecture. We recognized that every SAN system would ultimately fail, and that implementing a highly redundant system using SAN technology would be cost-prohibitive. In response, Exchange has evolved from requiring expensive, scaled-up, high-performance SAN storage and related peripherals, to now being able to run on cheap, scaled-out servers with commodity, low-performance SAS/SATA drives in a JBOD configuration with commodity disk controllers. This architecture enables Exchange to be resilient to any storage related failure, while enabling you to deploy large mailboxes at a reasonable cost.
\n
By building the replication architecture into Exchange and optimizing Exchange for commodity storage, the failure mode is predictable from a storage perspective. This approach does not stop at the storage layer; redundant NICs, power supplies, etc., can also be removed from the server hardware. Whether it is a disk, controller, or motherboard that fails, the end result should be the same, another database copy is activated and takes over.
\n
The more complex the hardware or software architecture, the more unpredictable failure events can be. Managing failure at any scale is all about making recovery predictable, which drives the necessity to having predictable failure modes. Examples of complex redundancy are active/passive network appliance pairs, aggregation points on the network with complex routing configurations, network teaming, RAID, multiple fiber pathways, etc. Removing complex redundancy seems unintuitive on its face – how can removing redundancy increase availability? Moving away from complex redundancy models to a software-based redundancy model, creates a predictable failure mode.
\n
The PA removes complexity and redundancy where necessary to drive the architecture to a predictable recovery model: when a failure occurs, another copy of the affected database is activated.
\n
The PA is divided into four areas of focus:
\n\n
Namespace design
\n
Datacenter design
\n
Server design
\n
DAG design
\n\n
Namespace Design
\n
In the Namespace Planning and Load Balancing Principles articles, I outlined the various configuration choices that are available with Exchange 2013. From a namespace perspective, the choices are to either deploy a bound namespace (having a preference for the users to operate out of a specific datacenter) or an unbound namespace (having the users connect to any datacenter without preference).
\n
The recommended approach is to utilize the unbound model, deploying a single namespace per client protocol for the site resilient datacenter pair (where each datacenter is assumed to represent its own Active Directory site - see more details on that below). For example:
\n
\n
autodiscover.contoso.com
\n
For HTTP clients: mail.contoso.com
\n
For IMAP clients: imap.contoso.com
\n
For SMTP clients: smtp.contoso.com
\n
\n
Figure 1: Namespace Design
\n
Each namespace is load balanced across both datacenters in a configuration that does not leverage session affinity, resulting in fifty percent of traffic being proxied between datacenters. Traffic is equally distributed across the datacenters in the site resilient pair, via DNS round-robin, geo-DNS, or other similar solution you may have at your disposal. Though from our perspective, the simpler solution is the least complex and easier to manage, so our recommendation is to leverage DNS round-robin.
\n
In the event that you have multiple site resilient datacenter pairs in your environment, you will need to decide if you want to have a single worldwide namespace, or if you want to control the traffic to each specific datacenter pair by using regional namespaces. Ultimately your decision depends on your network topology and the associated cost with using an unbound model; for example, if you have datacenters located in North America and Europe, the network link between these regions might not only be costly, but it might also have high latency, which can introduce user pain and operational issues. In that case, it makes sense to deploy a bound model with a separate namespace for each region.
\n
Site Resilient Datacenter Pair Design
\n
To achieve a highly available and site resilient architecture, you must have two or more datacenters that are well-connected (ideally, you want a low round-trip network latency, otherwise replication and the client experience are adversely affected). In addition, the datacenters should be connected via redundant network paths supplied by different operating carriers.
\n
While we support stretching an Active Directory site across multiple datacenters, for the PA we recommend having each datacenter be its own Active Directory site. There are two reasons:
\n\n
Transport site resilience via Shadow Redundancy and Safety Net can only be achieved when the DAG has members located in more than one Active Directory site.
\n
Active Directory has published guidance that states that subnets should be placed in different Active Directory sites when the round trip latency is greater than 10ms between the subnets.
\n\n
Server Design
\n
In the PA, all servers are physical, multi-role servers. Physical hardware is deployed rather than virtualized hardware for two reasons:
\n\n
The servers are scaled to utilize eighty percent of resources during the worst-failure mode.
\n
Virtualization adds an additional layer of management and complexity, which introduces additional recovery modes that do not add value, as Exchange provides equivalent functionality out of the box.
\n\n
By deploying multi-role servers, the architecture is simplified as all servers have the same hardware, installation process, and configuration options. Consistency across servers also simplifies administration. Multi-role servers provide more efficient use of server resources by distributing the Client Access and Mailbox resources across a larger pool of servers. Client Access and Database Availability Group (DAG) resiliency is also increased, as there are more servers available for the load-balanced pool and for the DAG.
\n
Commodity server platforms (e.g., 2U, dual socket servers with no more than 24 processor cores and 96GB of memory, that hold 12 large form-factor drive bays within the server chassis) are use in the PA. Additional drive bays can be deployed per-server depending on the number of mailboxes, mailbox size, and the server’s scalability.
\n
Each server houses a single RAID1 disk pair for the operating system, Exchange binaries, protocol/client logs, and transport database. The rest of the storage is configured as JBOD, using large capacity 7.2K RPM serially attached SCSI (SAS) disks (while SATA disks are also available, the SAS equivalent provides better IO and a lower annualized failure rate). Bitlocker is used to encrypt each disk, thereby providing data encryption at rest and mitigating concerns around data theft via disk replacement.
\n
To ensure that the capacity and IO of each disk is used as efficiently as possible, four database copies are deployed per-disk. The normal run-time copy layout (calculated in the Exchange 2013 Server Role Requirements Calculator) ensures that there is no more than a single copy activated per-disk.
\n
Figure 2: Server Design
\n
At least one disk in the disk pool is reserved as a hot spare. AutoReseed is enabled and quickly restores database redundancy after a disk failure by activating the hot spare and initiating database copy reseeds.
\n
Database Availability Group Design
\n
Within each site resilient datacenter pair you will have one or more DAGs.
\n
DAG Configuration
\n
As with the namespace model, each DAG within the site resilient datacenter pair operates in an unbound model with active copies distributed equally across all servers in the DAG. This model provides two benefits:
\n\n
Ensures that each DAG member’s full stack of services is being validated (client connectivity, replication pipeline, transport, etc.).
\n
Distributes the load across as many servers as possible during a failure scenario, thereby only incrementally increasing resource utilization across the remaining members within the DAG.
\n\n
Each datacenter is symmetrical, with an equal number of member servers within a DAG residing in each datacenter. This means that each DAG contains an even number of servers and uses a witness server for quorum arbitration.
\n
The DAG is the fundamental building block in Exchange 2013. With respect to DAG size, a larger DAG provides more redundancy and resources. Within the PA, the goal is to deploy larger DAGs (typically starting out with an eight member DAG and increasing the number of servers as required to meet your requirements) and only create new DAGs when scalability introduces concerns over the existing database copy layout.
\n
DAG Network Design
\n
Since the introduction of continuous replication in Exchange 2007, Exchange has recommended multiple replication networks for separating client traffic from replication traffic. Deploying two networks allows you to isolate certain traffic along different network pathways and ensure that during certain events (e.g., reseed events) the network interface is not saturated (which is an issue with 100Mb, and to a certain extent, 1Gb interfaces). However, for most customers, having two networks operating in this manner was only a logical separation, as the same copper fabric was used by both networks in the underlying network architecture.
\n
With 10Gb networks becoming the standard, the PA moves away from the previous guidance of separating client traffic from replication traffic. A single network interface is all that is needed because ultimately our goal is to achieve a standard recovery model despite the failure - whether a server failure occurs or a network failure occurs, the result is the same, a database copy is activated on another server within the DAG. This architectural change simplifies the network stack, and obviates the need to eliminate heartbeat cross-talk.
\n
Witness Server Placement
\n
Ultimately, the placement of the witness server determines whether the architecture can provide automatic datacenter failover capabilities or whether it will require a manual activation to enable service in the event of a site failure.
\n
If your organization has a third location with a network infrastructure that is isolated from network failures that affect the site resilient datacenter pair in which the DAG is deployed, then the recommendation is to deploy the DAG’s witness server in that third location. This configuration gives the DAG the ability to automatically failover databases to the other datacenter in response to a datacenter-level failure event, regardless of which datacenter has the outage.
\n
Figure 3: DAG (Three Datacenter) Design
\n
If your organization does not have a third location, then place the witness server in one of the datacenters within the site resilient datacenter pair. If you have multiple DAGs within the site resilient datacenter pair, then place the witness server for all DAGs in the same datacenter (typically the datacenter where the majority of the users are physically located). Also, make sure the Primary Active Manager (PAM) for each DAG is also located in the same datacenter.
\n
Data Resiliency
\n
Data resiliency is achieved by deploying multiple database copies. In the PA, database copies are distributed across the site resilient datacenter pair, thereby ensuring that mailbox data is protected from software, hardware and even datacenter failures.
\n
Each database has four copies, with two copies in each datacenter, which means at a minimum, the PA requires four servers. Out of these four copies, three of them are configured as highly available. The fourth copy (the copy with the highest Activation Preference) is configured as a lagged database copy. Due to the server design, each copy of a database is isolated from its other copies, thereby reducing failure domains and increasing the overall availability of the solution as discussed in DAG: Beyond the “A”.
\n
The purpose of the lagged database copy is to provide a recovery mechanism for the rare event of system-wide, catastrophic logical corruption. It is not intended for individual mailbox recovery or mailbox item recovery.
\n
The lagged database copy is configured with a seven day ReplayLagTime. In addition, the Replay Lag Manager is also enabled to provide dynamic log file play down for lagged copies. This feature ensures that the lagged database copy can be automatically played down and made highly available in the following scenarios:
\n
\n
When a low disk space threshold is reached
\n
When the lagged copy has physical corruption and needs to be page patched
\n
When there are fewer than three available healthy copies (active or passive) for more than 24 hours
\n
\n
By using the lagged database copy in this manner, it is important to understand that the lagged database copy is not a guaranteed point-in-time backup. The lagged database copy will have an availability threshold, typically around 90%, due to periods where the disk containing a lagged copy is lost due to disk failure, the lagged copy becoming an HA copy (due to automatic play down), as well as, the periods where the lagged database copy is re-building the replay queue.
\n
To protect against accidental (or malicious) item deletion, Single Item Recovery or In-Place Hold technologies are used, and the Deleted Item Retention window is set to a value that meets or exceeds any defined item-level recovery SLA.
\n
With all of these technologies in play, traditional backups are unnecessary; as a result, the PA leverages Exchange Native Data Protection.
\n
Summary
\n
The PA takes advantage of the changes made in Exchange 2013 to simplify your Exchange deployment, without decreasing the availability or the resiliency of the deployment. And in some scenarios, when compared to previous generations, the PA increases availability and resiliency of your deployment.
\n
Ross Smith IV Principal Program Manager Office 365 Customer Experience
","kudosSumWeight":1,"postTime":"2014-04-21T06:00:00.000-07:00","images":{"__typename":"AssociatedImageConnection","edges":[],"totalCount":0,"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}},"attachments":{"__typename":"AttachmentConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"tags":{"__typename":"TagConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[{"__typename":"TagEdge","cursor":"MjUuM3wyLjF8b3wxMHxfTlZffDE","node":{"__typename":"Tag","id":"tag:Client Access","text":"Client Access","time":"2019-07-01T15:23:48.608-07:00","lastActivityTime":null,"messagesCount":null,"followersCount":null}},{"__typename":"TagEdge","cursor":"MjUuM3wyLjF8b3wxMHxfTlZffDI","node":{"__typename":"Tag","id":"tag:Exchange 2013","text":"Exchange 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:"Category","id":"category:microsoftintune","categoryPolicies":{"__typename":"CategoryPolicies","canReadNode":{"__typename":"PolicyResult","failureReason":null}}},"ModerationData:moderation_data:586787":{"__typename":"ModerationData","id":"moderation_data:586787","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586787":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586787","revisionNum":1,"uid":586787,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586787"},"body":"Ross, would you still say that traditional backups are unnecessary even when a network worm takes out all IP connected servers? Wouldn't an off-site backup be the only way to recover your servers in that scenario? Remember, there is a reason we have to
apply Windows updates every month ;)
Also, the same threat exists with a malicious attacker (could be an internal disgruntled employee) who targets the host operating systems. Without an off-site backup your organization would have 100% data loss. Then you would be wishing for traditional backups
that are carried off-site.
","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-06-03T05:36:41.000-07:00","lastPublishTime":"2014-06-03T05:36:41.000-07:00","metrics":{"__typename":"MessageMetrics","views":16326},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586787","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586786":{"__typename":"ModerationData","id":"moderation_data:586786","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586786":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586786","revisionNum":1,"uid":586786,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586786"},"body":"Why the recommendation for hosting Exchange on physical servers? Microsoft is propagating all workloads to be virtualized on Hyper-V, so I don't get why Exchange 2013 should be running on physical servers. The arguments given in this article to host Exchange
on physical servers, are quite weak. First, most of the infrastructures I've seen have the capacity to host Exchange in VM's in worst case scenario's, second, the complexity which is added by virtualize Exchange, is actually no complexity, as SysAdmins are
getting more and more proficient into managing virtual platforms. It's like the Exchange department is contradicting Microsoft's vision of putting everything in the cloud (which means in this case virtualizing the workloads). Please enlighten me (-:
","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-05-16T09:04:12.000-07:00","lastPublishTime":"2014-05-16T09:04:12.000-07:00","metrics":{"__typename":"MessageMetrics","views":16320},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586786","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586785":{"__typename":"ModerationData","id":"moderation_data:586785","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586785":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586785","revisionNum":1,"uid":586785,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586785"},"body":"@Ross - Thanks that covers my question superbly. I had been hesitant to recommend Exchnage Native Data Protection because that answer was missing. With this, I am much more comfortable in supporting that choice. Cheers.","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-05-14T04:58:57.000-07:00","lastPublishTime":"2014-05-14T04:58:57.000-07:00","metrics":{"__typename":"MessageMetrics","views":16321},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586785","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586784":{"__typename":"ModerationData","id":"moderation_data:586784","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586784":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586784","revisionNum":1,"uid":586784,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586784"},"body":"great post.
are there any plans to highlight this critical bug on the blog? it would be good to let anyone who hasn't migrated mailboxes yet to not get rid of their old DBs - this is wreaking havoc for us and a lot of others:
http://social.technet.microsoft.com/Forums/en-US/291b583f-f228-4502-b7f0-604499fd8d37/error-databaseguidnotfound?forum=exchangesvrmobility&prof=required","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-05-06T23:39:45.000-07:00","lastPublishTime":"2014-05-06T23:39:45.000-07:00","metrics":{"__typename":"MessageMetrics","views":16317},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586784","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586783":{"__typename":"ModerationData","id":"moderation_data:586783","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586783":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586783","revisionNum":1,"uid":586783,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586783"},"body":"it would be nice if Microsoft preferred architecture was revealed on the same TIME that the product became GA, and even nicer if Microsoft Exchange advisers would know that before they advice for customers....","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-05-04T14:41:17.000-07:00","lastPublishTime":"2014-05-04T14:41:17.000-07:00","metrics":{"__typename":"MessageMetrics","views":16319},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586783","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586782":{"__typename":"ModerationData","id":"moderation_data:586782","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586782":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586782","revisionNum":1,"uid":586782,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586782"},"body":"Hello Ross,
Great article that compiles main parts of the Exchange 2013 design but may be it was interesting to have a guidance about \"Dynamic cluster\" with Windows Server 2012 R2 as explained in the Schott blog post.
Any input about that : dynamic quorum and no DAG CNO ?
Thanks a lot.","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-04-30T09:05:17.000-07:00","lastPublishTime":"2014-04-30T09:05:17.000-07:00","metrics":{"__typename":"MessageMetrics","views":16315},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586782","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586781":{"__typename":"ModerationData","id":"moderation_data:586781","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586781":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586781","revisionNum":1,"uid":586781,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586781"},"body":"First ,excellent post and thanks. 1. regarding dns, if we use dns round robin(client gets different response every time) we rely on dns cache right? so better use two ips but disable round robin(at the \"internet\"/\"access level so the clients can recover from a datacenter outage quicker no? 2. how can we utilize even 1gb link when the underlying disk subsystem(sata/sas) cannot even get to these speeds on jbods?(that's one of the main things which was always negative for me when discussing with clients the jbod approach which I support)
Thanks again","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-04-22T16:24:43.000-07:00","lastPublishTime":"2014-04-22T16:24:43.000-07:00","metrics":{"__typename":"MessageMetrics","views":16315},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586781","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586780":{"__typename":"ModerationData","id":"moderation_data:586780","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586780":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586780","revisionNum":1,"uid":586780,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586780"},"body":"Great info. It would be great to hear about some of the patching strategies that O365 has adopted and if some large on-prem folks could take away any good ideas. Lastly, does O365 utilize any of the PowerShell DSC coolness?","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-04-22T12:07:05.000-07:00","lastPublishTime":"2014-04-22T12:07:05.000-07:00","metrics":{"__typename":"MessageMetrics","views":16322},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586780","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586779":{"__typename":"ModerationData","id":"moderation_data:586779","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586779":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586779","revisionNum":1,"uid":586779,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586779"},"body":"Very interesting! Can you provide som additional details o. The JBOD? You let each of the 10 data disk become a seperate volume and drive letter (or mount in a directory) or do you configure Storage Spaces with Simple/Mirror/Parity?","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"203","kudosSumWeight":0,"repliesCount":0,"postTime":"2014-04-22T05:53:51.000-07:00","lastPublishTime":"2014-04-22T05:53:51.000-07:00","metrics":{"__typename":"MessageMetrics","views":16322},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:586755/message:586779","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"ModerationData:moderation_data:586778":{"__typename":"ModerationData","id":"moderation_data:586778","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:586778":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:-1"},"id":"message:586778","revisionNum":1,"uid":586778,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:586755"},"conversation":{"__ref":"Conversation:conversation:586755"},"subject":"Re: The Preferred Architecture","moderationData":{"__ref":"ModerationData:moderation_data:586778"},"body":"What exactly is the following quoted text referring to? \"The purpose of the lagged database copy is to provide a recovery mechanism for the rare event of system-wide, catastrophic logical corruption.\" What type of corruption and how would this corruption be detected? Especially in 7 days. I have seen this reference before, with no clear 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Microsoft
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